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Preparation method and application of a compound carrier metal nanometer catalyst

A composite carrier and metal nanotechnology, which is applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, oxidation to prepare carbonyl compounds, etc., can solve the problem of catalyst selectivity decline, catalyst life shortening, and material circulation volume Increase and other problems to achieve the effect of improved activity and stability, high mechanical strength, and improved activity

Inactive Publication Date: 2008-03-19
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dehydrogenation reaction of cyclohexanol is mostly carried out at low temperature, resulting in a low conversion rate per pass, and the low conversion rate leads to product refining in the later stage, and the circulation of materials increases, resulting in increased energy consumption and material consumption
In order to increase the conversion rate, the method of increasing the reaction temperature is usually adopted, but when the temperature is increased to increase the conversion rate, the selectivity of the catalyst is often reduced, and the catalyst life is shortened when the reaction temperature is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Preparation and application of Cu-Ce-Co / Mg-Al-activated carbon catalyst

[0021] 36.24g (0.15mol) Cu(NO 3 ) 2 ·3H 2 O, 2.46g (0.0056mol) Ce(NO 3 ) 3 ·6H 2 O, 39.04g (0.15mol) Mg(NO 3 ) 2 ·6H 2 O, 1.63g (0.0056mol) Co(NO 3 ) 2 ·6H 2 O mix, add 1.5ml 65%-68% HNO 3 Heat to dissolve, and use ultrasonic wave to process the solution during the dissolution process of the catalyst active component solution. The frequency of the ultrasonic wave is 40KHz, and the power is 400W. al 2 o 3 ·H 2 O, and 1.80g (0.15mol) of activated carbon in a mortar, fully ground for 30min until the catalyst active component and the composite carrier are mixed evenly and jelly-like with a certain toughness at the same time to obtain a catalyst gel, and then the catalyst gel is extruded Extruded into a strip, cut into 1-3mm length, dried in an oven at 110°C for 4 hours, and then roasted in a muffle furnace for 4 hours to obtain an oxidized catalyst (the composition should ...

Embodiment 2

[0025] Embodiment 2: Preparation and application of Cu-Ce / Mg-Al-activated carbon catalyst

[0026] 36.24g (0.15mol) Cu(NO 3 ) 2 ·3H 2 O, 2.46g (0.0056mol) Ce(NO 3 ) 3 ·6H 2 O, 41.46g (0.15mol) Mg(NO 3 ) 2 ·6H 2 O, add 1.5ml 65%-68% HNO 3 Heat to dissolve, and use ultrasonic wave to process the solution during the dissolution process of the catalyst active component solution. The frequency of the ultrasonic wave is 40KHZ, and the power is 160W. 2 o 3 ·H 2O and 0.90g (0.075mol) of activated carbon in a mortar, fully ground for 30min until the catalyst active component and the composite carrier are mixed evenly and jelly-like with certain toughness at the same time to obtain the catalyst gel, and then the catalyst gel is extruded Extruded, dried in an oven at 110°C for 4 hours, and then roasted in a muffle furnace for 4 hours to obtain an oxidized catalyst (its composition should be mainly CuO-CeO / MgO-Al 2 o 3 ).

[0027] Catalytic reaction: put 10g of oxidized cata...

Embodiment 3

[0028] Embodiment 3: Preparation and application of Cu-Ce / Mg-Al-activated carbon catalyst

[0029] 48.32g (0.20mol) Cu(NO 3 ) 2 ·3H 2 O, 3.28g (0.0075mol) Ce(NO 3 ) 3 ·6H 2 O, 51.28g (0.20mol) Mg(NO 3 ) 2 ·6H 2 O mix, add 1.5ml 65%-68% HNO 3 Heating and dissolving with 2ml of water, and using ultrasonic treatment solution in the dissolving process of catalyst active component solution, the frequency of ultrasonic is 40KHz, the power is 200W, then pour the salt solution mixed uniformly by ultrasonic into a container containing 39.01g (0.33mol) γ-Al 2 o 3 ·H 2 0. In the mortar and mortar of 0.2.40g (0.20mol) gac, fully grind 40min to catalyst active component and composite carrier mix uniformly and jelly-like have certain toughness simultaneously, obtain catalyst gel, then catalyst gel is used extruder Extruded, cut into 1-3mm length, dried in an oven at 110°C for 6 hours, and then roasted in a muffle furnace for 4 hours to obtain an oxidized catalyst (its compositio...

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Abstract

The invention relates to a preparation method of composite carrier metal nanometer catalyst and the application. Copper is used as the main activity catalytic component; one or a plurality of the elements, cobalt, nickel, iron, cerium and lanthanum is / are used as an auxiliary activity catalytic component or components; alumina is used as the main carrier; one or a plurality of the compounds, magnesium oxide or magnesium nitrate, silica, calcium oxide or calcium nitrate, zirconia, molecular sieve is / are used as composite carrier or carriers. The composite carrier metal nanometer catalyst is prepared in the following procedures: 1.the preparation of the catalyst solution; 2. catalyst gel preparation; 3. extruded catalyst preparation. When applied in catalytic dehydrogenation method to prepare cyclohexanone, the catalyst of the invention has the advantages that: the roasted catalyst has greater specific surface area, thereby improving the activity of the catalyst; that high temperature activity and stability is greatly improved; that cyclohexanone yield reaches above 90 percent; that the conversion rate and the selectivity reaches the highest point reported in documents; and that the catalyst performs good effects in service life experiment.

Description

technical field [0001] The invention relates to a preparation method and application of a composite carrier metal nano catalyst, which belongs to the technical field of catalyst preparation in chemical synthesis. Background technique [0002] At present, the main catalyst used for the dehydrogenation of cyclohexanol is a copper-based catalyst. The known catalyst mainly includes Cu, and metals such as Zn, Fe, Ni, La, Pb, Ru, and alkaline earth metals are added to it. The preparation method is mainly to load the active component copper and other doping metals on a carrier, and the carrier mainly includes Al 2 o 3 , SiO 2 , MgO, ZrO 2 , silicate, pumice, etc. The research results show that the dispersion degree of the catalyst active component in the carrier is the main factor affecting the catalyst activity. The preparation method is different, and the dispersion degree of the catalyst active component is also different. Usually, impregnation, precipitation, drying Catalys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/89C07C49/403C07C45/29
Inventor 白国义宁慧森王海龙
Owner HEBEI UNIVERSITY
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